Checking out or renewing items in the self check

After a staff user has logged into the self check interface, the interface
is ready for patrons to log in and check out or renew items.

The patron logs in by entering either their patron barcode or their user name.

The patron enters the barcode for each item. If the patron types the barcode,
they need to press the <Enter> key to check out the item. The item details,
including due date, appear below the barcode field.

When the patron is finished, they can click Logout if they want a receipt
for their items, or Logout (no receipt) if they prefer no receipt.